@Tania ..
Are you sure? Admin user can login cause admins accounts are normally 'manual', but other authentications could be active ... yes, I know you said they are not active ... but why would your Moodle ask for config if they were off? Both appear to be looking for new settings related to 'data mappings'.
So, let's see what's turned on in the DB ... as superuser or using credentials from config.php file try this query:
mysql> select name,value from mdl_config where name like 'auth';
What does that return?
You could try to put some text in the text boxes ... characters not true junk. Don't set them to check upon every login ... in other words, don't change the drop down pick list/options list, just leave them for defaults. That's just to get by the updates screen. Of course if you were really using CAS (sso) and Shilbo ... then those users auth via those will be locked out ... cannot log in. Might check with your networking folks/true server techs.
'spirit of sharing', Ken